Lexus ES: Skid Control ECU Communication Stop Mode
DESCRIPTION
Detection Item | Symptom | Trouble Area |
Skid Control ECU Communication Stop Mode | Any of the following conditions are met: | -
Brake booster with master cylinder assembly branch line or connector
-
Power source circuit of brake booster with master cylinder assembly
-
Brake booster with master cylinder assembly ground circuit
-
Brake booster with master cylinder assembly
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
-
Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
-
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
1. | CHECK FOR OPEN IN CAN BUS LINES (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY BRANCH LINE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the A45 brake booster with master cylinder assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | A45-43 (CA1H) - A45-42 (CA1L) | Cable disconnected from negative (-) auxiliary battery terminal | 54 to 69 Ω | A45-30 (CA2H) - A45-29 (CA2L) | Cable disconnected from negative (-) auxiliary battery terminal | 54 to 69 Ω | | | *a | Front view of wire harness connector (to Brake Booster with Master Cylinder Assembly) | | |
NG | | REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) |
OK | | |
2. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | A45-26 (GND1) - Body ground | Cable disconnected from negative (-) auxiliary battery terminal | Below 1 Ω | A45-39 (GND2) - Body ground | Cable disconnected from negative (-) auxiliary battery terminal | Below 1 Ω | | | *a | Front view of wire harness connector (to Brake Booster with Master Cylinder Assembly) | | |
(b) Reconnect the cable to the negative (-) auxiliary battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
A45-5 (+BI2) - Body ground | Power switch off | 11 to 14 V |
A45-15 (+BI1) - Body ground | Power switch off | 11 to 14 V |
A45-9 (IG2) - Body ground | Power switch on (IG) | 11 to 14 V |
A45-23 (IG1) - Body ground | Power switch on (IG) | 11 to 14 V |
OK | | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
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